Improvement in safety-valves



T. R OWE.

SAFETY VALVE.

No 90,874. PatentedJune 1, 1869.

72771 as s 65.

new one,

THOMAS ROWE, OFNE'W YORK,- N. Y.

Letters Patent No. 90,874, dated June 1,1869.

IIEPROVEMENT IN SAFETY-VALVES.

The Schedule referred to in these Letters Patent and making part of the lame.

To all whom it may comma:

Be it known that I, THOMAS Rows, of the city,

county, and State of New York, have invented a new and improved Combination Pressure-Gauge and Safety-Valve; and I do hereby dec are the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being bad to the accompanying drawing, forming part of this specification, which drawing represents a longitudinal section of'this invention. p

This invention relates to a pressure-gauge safetyvalve, which is intended for steam and other euginery. The letter A designates a piston, which isfitted into' acylinder, B, so that it moves freely therein, without, however, allowing any. water or steam to escape.

The cylinder B communicates, by pipes G D, with the water-chamber, or steam-generator, the pressure of which is to be gauged, and the piston A connects by a rod, E, with a lever, F.

To insure freedom of motion, said piston is made in the. form of a trunk, and the rod E-is connected to it :2; hinged joint a, as shown in the drawing.

1e lever F has its fulcrum on a pivot, b, secured the pipe 4]), Iead'mgto the water-chamber or steam-- genemtor.

, The safety-valve is made in the ordinary manner, with a conical 'face fitting into a correspondin seat, and, if said safety-valve is raised by the pres re of steam or water, the surplus steam or water escapes I through the blow-oft or discharge-pipe O.

The lever K is loaded with a-weight, which is movable on the same, so that the pressure exerted on. the safety-valve can be regulated to suit circumstances.

The spring-balance J is so adjusted that the register is connected to the lever F, and the index to the lever K, so that, when the lever F is raised by the action of the steam on the piston A, the register slides up under the index, and the amount ofprcssure acting on the piston is indicated.

The safety-valves generally used in hydraulic presses are cylindrical plugs, with a-couical face fitting into a corresponding conical seat, and the passage leading from this seat to the water-chamber is quite narrow, so that the area of the safety-valve exposed to the pressure of the water is quite small. I

It, therefore, the safety-v" lve binds or sticks only very little in its seat, the'pressure of the u ateris unable to lift the valve, and the water-chamber bursts.

By my improvement the safety-valve can be loaded dorm to the-desired amount, and if the pressure has reached the desired limit, the safety valve is entirely relieved of all weight, and it is free to blow oil.

This object is elfected by the action of the piston A and springbalance J. v

The piston offers a comparatively large area to the pressure of steam, audit is not liable tostick.

As soon as it begins to rise, the spring-balance exerts a strain on the lever K, audit thisstrain has reached the desired degree, as indicated on the dial of thebalauce, the safety-valve opens and blows off.

Having thus described my invention, I What I claim as new, and desire to secure by Letters Patent, isg The combination of the piston A, lever F, springbalance J, lever K, and safety-valve K, all constructed substantially as shown and described.

THOMAS ROWE.

Witnesses:

W. HAUFF, Enuns'r E. KASTENHU'BER. 

